package com.roshine.lookbar.commonlib.wight;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.os.Vibrator;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.TranslateAnimation;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

import com.roshine.lookbar.commonlib.utils.DisplayUtil;

public class DragGrid extends GridView {
	/** 点击时候的X位置 */
	public int downX;
	/** 点击时候的Y位置 */
	public int downY;
	/** 点击时候对应整个界面的X位置 */
	public int windowX;
	/** 点击时候对应整个界面的Y位置 */
	public int windowY;
	/** 屏幕上的X */
	private int win_view_x;
	/** 屏幕上的Y*/
	private int win_view_y;
	/** 拖动的里x的距离  */
	int dragOffsetX;
	/** 拖动的里Y的距离  */
	int dragOffsetY;
	/** 长按时候对应postion */
	public int dragPosition;
	/** Up后对应的ITEM的Position */
	private int dropPosition;
	/** 开始拖动的ITEM的Position*/
	private int startPosition;
	/** item高 */
	private int itemHeight;
	/** item宽 */
	private int itemWidth;
	/** 拖动的时候对应ITEM的VIEW */
	private View dragImageView = null;
	/** 长按的时候ITEM的VIEW*/
	private ViewGroup dragItemView = null;
	/** WindowManager管理器 */
	private WindowManager windowManager = null;
	/** */
	private WindowManager.LayoutParams windowParams = null;
	/** item总量*/
	private int itemTotalCount;
	/** 一行的ITEM数量*/
	private int nColumns = 4;
	/** 行数 */
	private int nRows;
	/** 剩余部分 */
	private int Remainder;
	/** 是否在移动 */
	private boolean isMoving = false;
	/** */
	private int holdPosition;
	/** 拖动的时候放大的倍数 */
	private double dragScale = 1.2D;
	/** 震动器  */
	private Vibrator mVibrator;
	/** 每个ITEM之间的水平间距 */
	private int mHorizontalSpacing = 15;
	/** 每个ITEM之间的竖直间距 */
	private int mVerticalSpacing = 15;
	/* 移动时候最后个动画的ID */
	private String LastAnimationID;
	
	private int forceChannelNum;//强制显示并且不能拖动的条目总数
	
	public int getForceChannelNum() {
		return forceChannelNum;
	}

	public void setForceChannelNum(int forceChannelNum) {
		this.forceChannelNum = forceChannelNum;
	}

	public DragGrid(Context context) {
		super(context);
		init(context);
	}

	public DragGrid(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init(context);
	}

	public DragGrid(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}

	public void init(Context context){
		mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
		//将布局文件中设置的间距dip转为px
		mHorizontalSpacing = DisplayUtil.dp2px(context, mHorizontalSpacing);
	}
	
	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
		// TODO Auto-generated method stub
		if (ev.getAction() == MotionEvent.ACTION_DOWN) {
			downX = (int) ev.getX();
			downY = (int) ev.getY();
			windowX = (int) ev.getX();
			windowY = (int) ev.getY();
			setOnItemClickListener(ev);
		}
		return super.onInterceptTouchEvent(ev);
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		// TODO Auto-generated method stub
		boolean bool = true;
		if (dragImageView != null && dragPosition != AdapterView.INVALID_POSITION) {
			// 移动时候的对应x,y位置
			bool = super.onTouchEvent(ev);
			int x = (int) ev.getX();
			int y = (int) ev.getY();
			switch (ev.getAction()) {
			case MotionEvent.ACTION_DOWN:
				downX = (int) ev.getX();
				windowX = (int) ev.getX();
				downY = (int) ev.getY();
				windowY = (int) ev.getY();
				break;
			case MotionEvent.ACTION_MOVE:
				onDrag(x, y ,(int) ev.getRawX() , (int) ev.getRawY());
				if (!isMoving){
					OnMove(x, y);
				}
				if (pointToPosition(x, y) != AdapterView.INVALID_POSITION){
					break;
				}
				break;
			case MotionEvent.ACTION_UP:
				stopDrag();
				onDrop(x, y);
				requestDisallowInterceptTouchEvent(false);
				break;

			default:
				break;
			}
		}
		return super.onTouchEvent(ev);
	}
	
	/** 在拖动的情况 */
	private void onDrag(int x, int y , int rawx , int rawy) {
		if (dragImageView != null) {
			windowParams.alpha = 0.6f;
//			windowParams.x = rawx - itemWidth / 2;
//			windowParams.y = rawy - itemHeight / 2;
			windowParams.x = rawx - win_view_x;
			windowParams.y = rawy - win_view_y;
			windowManager.updateViewLayout(dragImageView, windowParams);
		}
	}

	/** 在松手下放的情况 */
	private void onDrop(int x, int y) {
		// 根据拖动到的x,y坐标获取拖动位置下方的ITEM对应的POSTION
		int tempPostion = pointToPosition(x, y);
//		if (tempPostion != AdapterView.INVALID_POSITION) {
			dropPosition = tempPostion;
			DragAdapter mDragAdapter = (DragAdapter) getAdapter();
			//显示刚拖动的ITEM
			mDragAdapter.setShowDropItem(true);
			//刷新适配器，让对应的ITEM显示
			mDragAdapter.notifyDataSetChanged();
//		}
	}
	/**
	 * 长按点击监听
	 * @param ev
	 */
	public void setOnItemClickListener(final MotionEvent ev) {
		setOnItemLongClickListener(new OnItemLongClickListener() {

			@Override
			public boolean onItemLongClick(AdapterView<?> parent, View view,
					int position, long id) {
				try {
					int x = (int) ev.getX();// 长安事件的X位置
					int y = (int) ev.getY();// 长安事件的y位置

					startPosition = position;// 第一次点击的postion
					dragPosition = position;
					if(forceChannelNum>0){
						if (startPosition < forceChannelNum) {
							return false;
						}
					}
//					if (startPosition <=1) {
//						return false;
//					}
					ViewGroup dragViewGroup = (ViewGroup) getChildAt(dragPosition - getFirstVisiblePosition());
					TextView dragTextView = (TextView)dragViewGroup.findViewById(com.roshine.lookbar.commonlib.R.id.text_item);
					dragTextView.setSelected(true);
					dragTextView.setEnabled(false);
					itemHeight = dragViewGroup.getHeight();
					itemWidth = dragViewGroup.getWidth();
					itemTotalCount = DragGrid.this.getCount();
					int row = itemTotalCount / nColumns;// 算出行数
					Remainder = (itemTotalCount % nColumns);// 算出最后一行多余的数量
					if (Remainder != 0) {
						nRows = row + 1;
					} else {
						nRows = row;
					}
					// 如果特殊的这个不等于拖动的那个,并且不等于-1
					if (dragPosition != AdapterView.INVALID_POSITION) {
						// 释放的资源使用的绘图缓存。如果你调用buildDrawingCache()手动没有调用setDrawingCacheEnabled(真正的),你应该清理缓存使用这种方法。
						win_view_x = windowX - dragViewGroup.getLeft();//VIEW相对自己的X，半斤
						win_view_y = windowY - dragViewGroup.getTop();//VIEW相对自己的y，半斤
						dragOffsetX = (int) (ev.getRawX() - x);//手指在屏幕的上X位置-手指在控件中的位置就是距离最左边的距离
						dragOffsetY = (int) (ev.getRawY() - y);//手指在屏幕的上y位置-手指在控件中的位置就是距离最上边的距离
						dragItemView = dragViewGroup;
						dragViewGroup.destroyDrawingCache();
						dragViewGroup.setDrawingCacheEnabled(true);
						Bitmap dragBitmap = Bitmap.createBitmap(dragViewGroup.getDrawingCache());
						mVibrator.vibrate(50);//设置震动时间
						startDrag(dragBitmap, (int)ev.getRawX(),  (int)ev.getRawY());
						hideDropItem();
						dragViewGroup.setVisibility(View.INVISIBLE);
						isMoving = false;
						requestDisallowInterceptTouchEvent(true);
						return true;
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
				return false;
			}
		});
	}

	public void startDrag(Bitmap dragBitmap, int x, int y) {
		stopDrag();
		windowParams = new WindowManager.LayoutParams();// 获取WINDOW界面的
		//Gravity.TOP|Gravity.LEFT;这个必须加  
		windowParams.gravity = Gravity.TOP | Gravity.LEFT;
//		windowParams.x = x - (int)((itemWidth / 2) * dragScale);
//		windowParams.y = y - (int) ((itemHeight / 2) * dragScale);
		//得到preview左上角相对于屏幕的坐标   
		windowParams.x = x - win_view_x;
		windowParams.y = y  - win_view_y; 
//		this.windowParams.x = (x - this.win_view_x + this.viewX);//位置的x值
//		this.windowParams.y = (y - this.win_view_y + this.viewY);//位置的y值
		//设置拖拽item的宽和高  
		windowParams.width = (int) (dragScale * dragBitmap.getWidth());// 放大dragScale倍，可以设置拖动后的倍数
		windowParams.height = (int) (dragScale * dragBitmap.getHeight());// 放大dragScale倍，可以设置拖动后的倍数
		this.windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE                           
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE                           
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON                           
                | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
		this.windowParams.format = PixelFormat.TRANSLUCENT;
		this.windowParams.windowAnimations = 0;
		ImageView iv = new ImageView(getContext());
		iv.setImageBitmap(dragBitmap);
		windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);// "window"
		windowManager.addView(iv, windowParams);
		dragImageView = iv;
	}

	/** 停止拖动 ，释放并初始化 */
	private void stopDrag() {
		if (dragImageView != null) {
			windowManager.removeView(dragImageView);
			dragImageView = null;
		}
	}

	/** 在ScrollView内，所以要进行计算高度 */
	@Override
	public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);
		super.onMeasure(widthMeasureSpec, expandSpec);
	}
	
	/** 隐藏 放下 的ITEM*/
	private void hideDropItem() {
		((DragAdapter) getAdapter()).setShowDropItem(false);
	}
	
	/** 获取移动动画 */
	public Animation getMoveAnimation(float toXValue, float toYValue) {
		TranslateAnimation mTranslateAnimation = new TranslateAnimation(
				Animation.RELATIVE_TO_SELF, 0.0F,
				Animation.RELATIVE_TO_SELF,toXValue, 
				Animation.RELATIVE_TO_SELF, 0.0F,
				Animation.RELATIVE_TO_SELF, toYValue);// 当前位置移动到指定位置
		mTranslateAnimation.setFillAfter(true);// 设置一个动画效果执行完毕后，View对象保留在终止的位置。
		mTranslateAnimation.setDuration(300L);
		return mTranslateAnimation;
	}
	
	/** 移动的时候触发*/
	public void OnMove(int x, int y) {
		try {
			// 拖动的VIEW下方的POSTION
			int dPosition = pointToPosition(x, y);
			// 判断下方的POSTION是否是最开始2个不能拖动的
//			if(forceChannelNum>0){
//				if (dPosition > forceChannelNum-1) {
//				if (dPosition > 1) {
			        if ((dPosition == -1) || (dPosition == dragPosition)){
			        	return;
			        }
				    dropPosition = dPosition;
				    if (dragPosition != startPosition){
				    	dragPosition = startPosition;
				    }
					int movecount;
					//拖动的=开始拖的，并且 拖动的 不等于放下的
				    if ((dragPosition == startPosition) || (dragPosition != dropPosition)){
				    	//移需要移动的动ITEM数量
				    	movecount = dropPosition - dragPosition;
				    }else{
				    	//移需要移动的动ITEM数量为0
				    	movecount = 0;
				    }
				    if(movecount == 0){
				    	return;
				    }
				    
				    int movecount_abs = Math.abs(movecount);
				    
					if (dPosition != dragPosition) {
						//dragGroup设置为不可见
						ViewGroup dragGroup = (ViewGroup) getChildAt(dragPosition);
						dragGroup.setVisibility(View.INVISIBLE);
						float to_x = 1;// 当前下方positon
						float to_y;// 当前下方右边positon
						//x_vlaue移动的距离百分比（相对于自己长度的百分比）
						float x_vlaue = ((float) mHorizontalSpacing / (float) itemWidth) + 1.0f;
						//y_vlaue移动的距离百分比（相对于自己宽度的百分比）
						float y_vlaue = ((float) mVerticalSpacing / (float) itemHeight) + 1.0f;
//						LogUtil.showI("x_vlaue", "x_vlaue = " + x_vlaue);
						for (int i = 0; i < movecount_abs; i++) {
							 to_x = x_vlaue;
							 to_y = y_vlaue;
							//像左
							if (movecount > 0) {
								// 判断是不是同一行的
								holdPosition = dragPosition + i + 1;
								if (dragPosition / nColumns == holdPosition / nColumns) {
									to_x = - x_vlaue;
									to_y = 0;
								} else if (holdPosition % 4 == 0) {
									to_x = 3 * x_vlaue;
									to_y = - y_vlaue;
								} else {
									to_x = - x_vlaue;
									to_y = 0;
								}
							}else{
								//向右,下移到上，右移到左
								holdPosition = dragPosition - i - 1;
								if (dragPosition / nColumns == holdPosition / nColumns) {
									to_x = x_vlaue;
									to_y = 0;
								} else if((holdPosition + 1) % 4 == 0){
									to_x = -3 * x_vlaue;
									to_y = y_vlaue;
								}else{
									to_x = x_vlaue;
									to_y = 0;
								}
							}
							ViewGroup moveViewGroup = (ViewGroup) getChildAt(holdPosition);
							Animation moveAnimation = getMoveAnimation(to_x, to_y);
							moveViewGroup.startAnimation(moveAnimation);
							//如果是最后一个移动的，那么设置他的最后个动画ID为LastAnimationID
							if (holdPosition == dropPosition) {
								LastAnimationID = moveAnimation.toString();
							}
							moveAnimation.setAnimationListener(new AnimationListener() {

								@Override
								public void onAnimationStart(Animation animation) {
									// TODO Auto-generated method stub
									isMoving = true;
								}

								@Override
								public void onAnimationRepeat(Animation animation) {
									// TODO Auto-generated method stub

								}

								@Override
								public void onAnimationEnd(Animation animation) {
									// TODO Auto-generated method stub
									// 如果为最后个动画结束，那执行下面的方法
									if (animation.toString().equalsIgnoreCase(LastAnimationID)) {
										DragAdapter mDragAdapter = (DragAdapter) getAdapter();
										mDragAdapter.exchange(startPosition,dropPosition);
										startPosition = dropPosition;
										dragPosition = dropPosition;
										isMoving = false;
									}
								}
							});
						}
//					}
//				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}